What is the ‘app’ Android XML namespace?

by

The app namespace is not specific to a library, but it is used for all attributes defined in your app, whether by your code or by libraries you import, effectively making a single global namespace for custom attributes – i.e., attributes not defined by the android system.

In this case, the appcompat-v7 library uses custom attributes mirroring the android: namespace ones to support prior versions of android (for example: android:showAsAction was only added in API11, but app:showAsAction (being provided as part of your application) works on all API levels your app does) – obviously using the android:showAsAction wouldn’t work on API levels where that attribute is not defined.

More Related Contents:

  1. What’s “tools:context” in Android layout files?
  2. My list view is lagging can anyone help me to fix this?
  3. Give Scroll view to only edittext in android
  4. Can the Android layout folder contain subfolders?
  5. How do I align views at the bottom of the screen?
  6. Android layout replacing a view with another view on run time
  7. Remove icon/logo from action bar on android
  8. Why this line xmlns:android=”http://schemas.android.com/apk/res/android” must be the first in the layout xml file?
  9. Toolbar overlapping below status bar
  10. Android: ScrollView vs NestedScrollView
  11. String Resource new line /n not possible?
  12. Put buttons at bottom of screen with LinearLayout?
  13. Android and setting alpha for (image) view alpha
  14. The specified child already has a parent. You must call removeView() on the child’s parent first
  15. Inflate layout programmatically within another layout
  16. Is it possible to make a ListView populate from the bottom?
  17. How do I create a header or footer button bar for my Android application
  18. Android XML Layout Parameters Do Not Function As Expected
  19. Android Studio – Firebase Fatal error
  20. How do I create a ListView with rounded corners in Android?
  21. Android Paint: .measureText() vs .getTextBounds()
  22. Is it a bad practice to use negative margins in Android?
  23. Scrollview can host only one direct child [duplicate]
  24. How can I dynamically create menu items?
  25. How to save the image to SD card on button Click android [closed]
  26. Android: how to draw a border to a LinearLayout
  27. RelativeLayout is taking fullscreen for wrap_content
  28. Why does calling getWidth() on a View in onResume() return 0?
  29. How to add views dynamically to a RelativeLayout already declared in the xml layout?
  30. Fixing Error in styles.xml to generate R.java : No resource found name ‘Theme.AppCompat.Light’

Leave a Comment